Critique of macro flow/damage surface representations for metal matrix composites using micromechanics

Research output: Contribution to journalArticle

Abstract

Guidance for the formulation of robust, multiaxial, constitutive models for advanced materials is provided by addressing theoretical and experimental issues using micromechanics. The multiaxial response of metal matrix composites, depicted in terms of macro flow/damage surfaces, is predicted at room and elevated temperatures using an analytical micromechanical model that includes viscoplastic matrix response as well as fiber-matrix debonding. Macro flow/damage surfaces (i.e., debonding envelopes, matrix threshold surfaces, macro "yield" surfaces, surfaces of constant inelastic strain rate, and surfaces of constant dissipation rate) are determined for silicon carbide/titanium in three stress spaces. Residual stresses are shown to offset the centers of the flow/damage surfaces from the origin and their shape is significantly altered by debonding. The results indicate which type of flow/damage surfaces should be characterized and what loadings applied to provide the most meaningful experimental data for guiding theoretical model development and verification.

Original languageEnglish (US)
Pages (from-to)283-298
Number of pages16
JournalAmerican Society of Mechanical Engineers, Aerospace Division (Publication) AD
Volume51
StatePublished - Dec 1 1996

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Composite micromechanics
micromechanics
metal matrix composites
Macros
damage
matrix
metal
Metals
Debonding
matrices
residual stress
Micromechanics
Constitutive models
strain rate
Silicon carbide
silicon carbides
titanium
silicon
Strain rate
dissipation

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Space and Planetary Science

Cite this

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title = "Critique of macro flow/damage surface representations for metal matrix composites using micromechanics",
abstract = "Guidance for the formulation of robust, multiaxial, constitutive models for advanced materials is provided by addressing theoretical and experimental issues using micromechanics. The multiaxial response of metal matrix composites, depicted in terms of macro flow/damage surfaces, is predicted at room and elevated temperatures using an analytical micromechanical model that includes viscoplastic matrix response as well as fiber-matrix debonding. Macro flow/damage surfaces (i.e., debonding envelopes, matrix threshold surfaces, macro {"}yield{"} surfaces, surfaces of constant inelastic strain rate, and surfaces of constant dissipation rate) are determined for silicon carbide/titanium in three stress spaces. Residual stresses are shown to offset the centers of the flow/damage surfaces from the origin and their shape is significantly altered by debonding. The results indicate which type of flow/damage surfaces should be characterized and what loadings applied to provide the most meaningful experimental data for guiding theoretical model development and verification.",
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